6000 câu trắc nghiệm tổng hợp Tiếng Anh 2024 có đáp án (Phần 12)
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I (chat) ________ with my friends while my teacher (teach) ________ the lesson yesterday

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 I (chat) ________ with my friends while my teacher (teach) ________ the lesson yesterday.

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Giải thích

 I was chatting with my friends while my teacher (teach) was teaching the lesson yesterday.